Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
tham thuc » nham thuc, tam thuc, thai thuc
cay vanh » cay lanh, cay xanh, cac van
vanh dai » van dai, vanh tai, lanh dao
su sach » so sach, vu sach
cao hoi » cau hoi, cao hoc, tao hoi
sach v » sach va, sach y, sach 2
v nang » va nang, vu nang, van nang
co hoi » co hoc, co loi
cua su » qua su

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 v nang ((cao hoi) OR (co hoi)). lieu va ((tham thuc) or (pham thuc)) cay vanh dai cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach v nang ((cao hoi) OR (co hoi)). lieu va ((tham thuc) OR (pham thuc)) cay vanh dai cua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach v nang ((cao hoi) OR (co hoi)). lieu va ((tham thuc) or (pham thuc)) cay vanh dai cua su".
• Adding a wildcard symbol may retrieve word variants: su sach v nang ((cao hoi) OR (co hoi)). lieu va ((tham thuc) or (pham thuc)) cay vanh dai cua su*.