Perhaps you should try some spelling variations:
hanh gian » thanh gian, thanh giang, manh giang
gian cua » gian xu, ban cua
te sach » toc sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu va, hieu van
ve phan » va phan, ke phan, ve phat
dau van » dam van, dau va, cau van
dao van » do van, dang van
cua tre » cua te, cuu tre, cua triet

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