Perhaps you should try some spelling variations:
pham chuc » pham duc, pham huu, kham chua
thi nang » thi cong, ki nang, thi hanh
tai khoi » tai khoa, mai khoi, tao khoi
sach thi » sach thu, sach tai, sach thieu
hanh lai » hanh lam, hanh tai, thanh lap
so sach » so sanh, bo sach, co sach
va hanh » van hanh, va thanh, va danh
tai hoi » dai hoi, tai hai, tai hoe
lai cua » dai cua, hai cua, lai chau
hieu ve » hieu van
hieu va » lieu va, hieu qua
chuc va » thuc va, thuc vat
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sach thi nang ((tai hoi) or (tai khoi)). ((hieu ve) OR (hieu va)) pham chuc va hanh lai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sach thi nang ((tai hoi) OR (tai khoi)). ((hieu ve) OR (hieu va)) pham chuc va hanh lai cua te*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sach thi nang ((tai hoi) or (tai khoi)). ((hieu ve) OR (hieu va)) pham chuc va hanh lai cua te*".