Perhaps you should try some spelling variations:
thanh tai » thanh hai, thanh toan, doanh tai
cham truc » cau truc, nham thuc, pham thuc
cau tren » cu tren, dau tren, ca tren
dai khoi » dai khoa, mai khoi, dai kho
va thanh » gia thanh, ban thanh, va tinh
cuu tre » cua tre, cau treo
truc va » thuc va, thuc vat, trung va
te sach » toc sach
sach ky » sac ky, sach y, sach ty
hieu ve » hieu va, hieu van
dai hoi » dai hoc, dai hai, dai moi
ky lang » ky nang, ky dang, ky tang
ve cham » va cham, ve chat, vu cham

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky lang ((dai khoi) OR (dai hoi)). hieu ve cham truc va thanh tai ((cuu tre) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang ((dai khoi) OR (dai hoi)). hieu ve cham truc va thanh tai ((cuu tre) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang ((dai khoi) OR (dai hoi)). hieu ve cham truc va thanh tai ((cuu tre) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang ((dai khoi) OR (dai hoi)). hieu ve cham truc va thanh tai ((cuu tre) or (cau tren))*.