Perhaps you should try some spelling variations:
thien van » thi van
hanh gian » thanh gian, thanh giang, manh giang
hieu van » hieu va, lieu va, hieu ve
gian cua » gian xu, ban cua
sach thu » sach thue, sach thieu, sach tham
va hanh » van hanh, va thanh, va danh
cam loc » cam lo
sach tu » cach tu, sach ty, sach uu
sang ma » tang ma, nang ma, sang tao
cua tre » cua te, cuu tre, cua triet
ma hoi » mai hoi, xa hoi, ma hoa
loc va » hoc va, luc va

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 hoi. ((hieu van) OR (thien van)) cam loc 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 hoi. ((hieu van) OR (thien van)) cam loc va hanh gian cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu ((sach tu) or (sach thu)) sang ma hoi. ((hieu van) OR (thien van)) cam loc va hanh gian cua tre*".