Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
nham thuc » nhan thuc, nam thuc, nham thu
thu sach » tu sach, thuoc sach, thu hoach
dinh vai » dinh van, dinh vi, dinh va
van dinh » van minh, van dich, va dinh
thuc van » thuc vat, thuc dan, thuc va
tang mai » tang ma, tang tai, lang mai
mai hoi » mai khoi, dai hoi, lai hoi
hieu va » lieu va, hieu qua
va nham » va cham, va tham, va nha
ky tang » ky nang, ky dang, kho tang
vai cua » dai cua, hai cua, lai cua
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 tang mai hoi. hieu va nham thuc van dinh vai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (thuat sach)) ky tang mai hoi. hieu va nham thuc van dinh vai cua te.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (thuat sach)) ky tang mai hoi. hieu va nham thuc van dinh vai cua te*.