Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cham truc » cau truc, nham thuc, pham thuc
thu sach » tu sach, thuoc sach, thu hoach
hanh lai » hanh lam, hanh tai, thanh lap
cua tre » cuu tre, cua triet, dua tren
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
va cham » va chat, va tham
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu sach) or (thuat sach)) ky nang ma hoi. hieu va cham truc va hanh lai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuat sach)) ky nang ma hoi. hieu va cham truc va hanh lai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "((thu sach) or (thuat sach)) ky nang ma hoi. hieu va cham truc va hanh lai ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thuat sach)) ky nang ma hoi. hieu va cham truc va hanh lai ((cua tre) OR (cua te))*.