Perhaps you should try some spelling variations:
hanh gian » thanh gian, thanh giang, manh giang
gian cua » gian xu, ban cua
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, dac sac
phan dau » phan tu, hang dau
lang mai » lang dai, lang hai, lang man
va hanh » van hanh, va thanh, va danh
ve phan » va phan, ke phan, ve phat
mai hoi » mai khoi, dai hoi, lai hoi
hieu ve » hieu va, hieu van
ky lang » ky nang, ky dang, ky tang
cua tre » cua te, cuu tre, cua triet
dau va » dau ve, lau va

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 (toc sach))) or (doc sach)) ky lang mai hoi. hieu ve phan dau va hanh gian cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((te sach) OR (toc sach))) OR (doc sach)) ky lang mai hoi. hieu ve phan dau va hanh gian cua tre*.