Perhaps you should try some spelling variations:
cua triet » cua viet, su triet
va triet » va thiet, va trien, ve triet
sach thu » sach thue, sach thieu, sach tham
hanh dai » hanh tai, hanh dao, vanh dai
van hanh » van thanh, ban hanh, van anh
xach tay » canh tay
tuc van » thuc van, truc van, tuc va
cao tuc » dao tuc, cao duc, cao suc
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
va cao » va cac, va co, va dao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((xach tay) or (sach thu)) nang xa hoi. hieu va cao tuc van hanh dai ((cua triet) OR (va triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((xach tay) OR (sach thu)) nang xa hoi. hieu va cao tuc van hanh dai ((cua triet) OR (va triet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((xach tay) or (sach thu)) nang xa hoi. hieu va cao tuc van hanh dai ((cua triet) OR (va triet))".
• Adding a wildcard symbol may retrieve word variants: te ((xach tay) or (sach thu)) nang xa hoi. hieu va cao tuc van hanh dai ((cua triet) OR (va triet))*.