Perhaps you should try some spelling variations:
hanh lai » hanh lam, hanh tai, thanh lap
te sach » toc sach
lai cua » dai cua, hai cua, lai chau
luu van » cuu van, luan van, luu hanh
duc van » duc va, duc tan, duc manh
cua tre » cua te, cuu tre, cua triet
sach ty » sach y, sach tu, sach thu
hieu ve » hieu va, hieu van
nang ro » nang co, nang ho, nang ra
nang o » nang co, nang ho, nang x
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: te sach ty ((nang o) OR (nang ro)) hoi. hieu ve cam ((duc van) or (luu van)) hanh lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty ((nang o) OR (nang ro)) hoi. hieu ve cam ((duc van) OR (luu van)) hanh lai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty ((nang o) OR (nang ro)) hoi. hieu ve cam ((duc van) or (luu van)) hanh lai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sach ty ((nang o) OR (nang ro)) hoi. hieu ve cam ((duc van) or (luu van)) hanh lai cua tre*.