Perhaps you should try some spelling variations:
su triet » su viet, su tien
ve triet » va trien
hanh dai » hanh tai, hanh dao, vanh dai
van hanh » van thanh, ban hanh, van anh
hieu van » hieu va, thien van, lieu va
van pham » san pham, van phan, van phat
sach thu » sach thue, sach thieu, sach tham
nang xa » nang x, lang xa, nang ma
sach ty » sach y, sach tu, xach tay
duc van » duc va, duc tan, duc manh

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 ty) or (sach thu)) nang xa hoi. hieu van pham duc van hanh dai ((ve triet) or (su triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sach thu)) nang xa hoi. hieu van pham duc van hanh dai ((ve triet) OR (su triet)).
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sach thu)) nang xa hoi. hieu van pham duc van hanh dai ((ve triet) or (su triet))*.