Perhaps you should try some spelling variations:
hanh gian » thanh gian, thanh giang, manh giang
gian cua » gian xu, ban cua
sach thu » sach thue, sach thieu, sach tham
hieu van » hieu va, thien van, lieu va
va hanh » van hanh, va thanh, va danh
nam lam » nam nam, cam lam, lam lam
tang ma » mang may, tang van
sach tu » cach tu, sach ty, sach uu
sang ma » nang ma, sang tao, mang may
cua tre » cua te, cuu tre, cua triet
lam va » nam va, dam va, lam ha

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 tu) or (sach thu)) ((sang ma) or (tang ma)) hoi. hieu van nam lam va hanh gian cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach tu) OR (sach thu)) ((sang ma) OR (tang ma)) hoi. hieu van nam lam va hanh gian cua tre.
• Adding a wildcard symbol may retrieve word variants: tu ((sach tu) or (sach thu)) ((sang ma) or (tang ma)) hoi. hieu van nam lam va hanh gian cua tre*.