Perhaps you should try some spelling variations:
dang hanh » dang thanh, ban hanh, dang van
cua triet » cua viet, su triet, va triet
thuc dang » thuoc dang, thuc dan, thuc dung
hanh vai » hanh vi, hanh va, hanh tai
sach thu » sach thue, sach thieu, sach tham
hieu va » lieu va, hieu qua
vai cua » dai cua, hai cua, lai cua
sach ty » sach y, sach tu, xach tay
hieu ha » hieu hoa, hieu ca, hieu xa
nang xa » nang x, lang xa, nang ma

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

• Performing a fuzzy search may retrieve terms with similar spellings: su ((sach ty) OR (sach thu)) nang xa hoi. ((hieu ha) or (hieu va)) am thuc dang hanh vai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su ((sach ty) OR (sach thu)) nang xa hoi. ((hieu ha) OR (hieu va)) am thuc dang hanh vai cua triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su ((sach ty) OR (sach thu)) nang xa hoi. ((hieu ha) or (hieu va)) am thuc dang hanh vai cua triet*".