Perhaps you should try some spelling variations:
hanh lai » hanh lam, hanh tai, thanh lap
van hanh » van thanh, ban hanh, van anh
hieu ve » hieu va, hieu van
lai cua » dai cua, hai cua, lai chau
duc van » duc va, duc tan, duc manh
cam duc » cam xuc, cao duc, pham duc
tu sach » thu sach, su sach, tu cach
lang xa » lang ha, dang xay, lang van
nang xa » nang x, nang ma, mang xa
te sach » toc sach
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: ((tu sach) OR (te sach)) y ((nang xa) or (lang xa)) hoi. hieu ve cam duc van hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) y ((nang xa) OR (lang xa)) hoi. hieu ve cam duc van hanh lai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (te sach)) y ((nang xa) or (lang xa)) hoi. hieu ve cam duc van hanh lai cua tre".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (te sach)) y ((nang xa) or (lang xa)) hoi. hieu ve cam duc van hanh lai cua tre*.