Perhaps you should try some spelling variations:
hanh gian » thanh gian, thanh giang, manh giang
gian cua » gian xu, ban cua
hoc sach » hoc sinh, hoc cac, hoc anh
van hanh » van thanh, ban hanh, van anh
phan duc » pham duc, phan tu, phan dau
kho tang » cao tang
te sach » toc sach
duc van » duc va, duc tan, duc manh
ve phan » va phan, ke phan, ve phat
hieu ve » hieu va, hieu van
cua tre » cua te, cuu tre, cua triet
ky tang » ky nang, ky dang, ky trong
ma hoi » mai hoi, xa hoi, ma hoa

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) or (hoc sach)) ((ky tang) OR (kho tang)) ma hoi. hieu ve phan duc van hanh gian cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (hoc sach)) ((ky tang) OR (kho tang)) ma hoi. hieu ve phan duc van hanh gian cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) or (hoc sach)) ((ky tang) OR (kho tang)) ma hoi. hieu ve phan duc van hanh gian cua tre*".