Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hanh lai » hanh lam, hanh tai, thanh lap
cam truc » cau truc, nam truc, lam truoc
hieu ve » hieu va, hieu van
lai cua » dai cua, hai cua, lai chau
va hanh » van hanh, va thanh, va danh
truc va » thuc va, thuc vat, trung va
lang xa » lang ha, dang xay, lang van
mang xa » mang may, dang xay, mang cua
cua tre » cua te, cuu tre, cua triet
ve cam » ve cham, ve cac, va cam

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thu hoach) or (thuat sach)) ky ((mang xa) or (lang xa)) hoi. hieu ve cam truc va hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu hoach) OR (thuat sach)) ky ((mang xa) OR (lang xa)) hoi. hieu ve cam truc va hanh lai cua tre.
• Adding a wildcard symbol may retrieve word variants: ((thu hoach) or (thuat sach)) ky ((mang xa) or (lang xa)) hoi. hieu ve cam truc va hanh lai cua tre*.