Perhaps you should try some spelling variations:
ve triet » va trien, su triet
sach tai » sach bai, sach tham, sach xa
ban hanh » ban hang
van hanh » van thanh, van anh, van ban
sach dao » lanh dao
cam tuc » cam xuc, cam tu, nam thuc
lang va » lang van, hang va, lang ha
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
va hoi » xa hoi, va hoc, va hoa
vi ve » va ve, gi ve, ve ve

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 tai) OR (sach dao)) lang va hoi. hieu va cam tuc ((van hanh) or (ban hanh)) vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te ((sach tai) OR (sach dao)) lang va hoi. hieu va cam tuc ((van hanh) OR (ban hanh)) vi ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach tai) OR (sach dao)) lang va hoi. hieu va cam tuc ((van hanh) or (ban hanh)) vi ve triet".
• Adding a wildcard symbol may retrieve word variants: te ((sach tai) OR (sach dao)) lang va hoi. hieu va cam tuc ((van hanh) or (ban hanh)) vi ve triet*.