Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
tham truc » tham thuc, nham thuc, pham thuc
thu sach » tu sach, thuoc sach, thu hoach
hai cua » thai cua, dai cua, hoi cua
lai cua » dai cua, lai chau, thai cua
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
va tham » van tham, va cham, va thanh
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa

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