Perhaps you should try some spelling variations:
phat trung » pham trung, phap trung, pham truong
sach thue » sach thu, sach thieu, sach tham
thue hanh » thue thanh, thuc hanh, thuy hanh
cua triet » cua viet, su triet, va triet
trung va » truong va, trang va, trung ha
hanh dai » hanh tai, hanh dao, vanh dai
te sach » toc sach
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
co hoi » co hoc, co loi

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 thue hanh ((co hoi) or (xa hoi)). hieu va phat trung va hanh dai cua triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach thue hanh ((co hoi) OR (xa hoi)). hieu va phat trung va hanh dai cua triet.
• Adding a wildcard symbol may retrieve word variants: te sach thue hanh ((co hoi) or (xa hoi)). hieu va phat trung va hanh dai cua triet*.