Perhaps you should try some spelling variations:
cham thuc » nham thuc, pham thuc, tham thuc
va triet » va thiet, va trien, ve triet
phan lap » phan dau
van phan » van phong, van thanh, luan phan
thuc van » thuc vat, thuc dan, thuc va
hieu ve » hieu va, hieu van
tu sach » thu sach, su sach, tu cach
hieu vu » hieu va, hieu su, dieu vu
nang ho » nang hoc, nang co, tang ho
ty nang » ky nang, ty xang, ty hang
te sach » toc sach
ho hoi » hoc hoi, hoa hoi, hoi hoi
lap va » tap va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (te sach)) ty nang ho hoi. ((hieu vu) or (hieu ve)) cham thuc van phan lap va triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (te sach)) ty nang ho hoi. ((hieu vu) OR (hieu ve)) cham thuc van phan lap va triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (te sach)) ty nang ho hoi. ((hieu vu) or (hieu ve)) cham thuc van phan lap va triet*.