Perhaps you should try some spelling variations:
sach thu » sach thue, sach thieu, sach tham
van hanh » van thanh, ban hanh, van anh
cua tre » cua te, cuu tre, cua triet
hanh de » hanh ve, hanh kem
nang xa » nang x, lang xa, nang ma
luc van » luoc van, luu van, duc van
de cua » le cua, te cua, dieu cua
ve cac » va cac, vien cac
sac ky » cac ky, sai ky
ve cau » ke cau, va cau, le cau

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sac ky) or (sach thu)) nang xa hoi. hieu ((ve cau) OR (ve cac)) luc van hanh de cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sac ky) OR (sach thu)) nang xa hoi. hieu ((ve cau) OR (ve cac)) luc van hanh de cua tre*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sac ky) or (sach thu)) nang xa hoi. hieu ((ve cau) OR (ve cac)) luc van hanh de cua tre*".