Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
lang van » dang van, tang van, hoang van
anh thai » anh thi, anh tai, nhanh thai
thai cua » than cua, tai cuc, tri cua
tu sach » thu sach, su sach, te sach
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
qua cac » cua cac
cac duc » cac du, cao duc, cac dac
duc ban » duc tan, duc van, dua ban
ban anh » ban hanh, ban banh, ban danh

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 ((nang xa) or (lang van)) hoi. hieu qua cac duc ban anh thai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang xa) OR (lang van)) hoi. hieu qua cac duc ban anh thai cua triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang xa) or (lang van)) hoi. hieu qua cac duc ban anh thai cua triet*.