Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
tham luc » than luc, tham nuoc, nhan luc
lang van » dang van, tang van, hoang van
nhan tai » hang tai, van tai, toan tai
tai cuu » tai cuc, tai buu, tai cua
va nhan » van nhan, ca nhan, va phan
te sach » toc sach
sach ky » sac ky, sach y, sach ty
van hoi » van hoa, van hoc, van hoe
ky lang » ky nang, ky dang, ky tang
cuu tre » cua tre, cau tren, cau treo

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 van hoi. ((hieu qua) or (lieu va)) ((tham luc) OR (tham thuc)) va nhan tai cuu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang van hoi. ((hieu qua) OR (lieu va)) ((tham luc) OR (tham thuc)) va nhan tai cuu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang van hoi. ((hieu qua) or (lieu va)) ((tham luc) OR (tham thuc)) va nhan tai cuu tre".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang van hoi. ((hieu qua) or (lieu va)) ((tham luc) OR (tham thuc)) va nhan tai cuu tre*.