Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
thi nang » thi cong, thi hanh
so sach » bo sach, co sach, hoc sach
tai cua » thai cua, tai cuc, tri cua
van tai » von tai, van tuan
thuc va » thuc vat, thuc dan, thuc day
va pham » van pham, va phat, va phap
hieu va » lieu va, hieu qua
ki nang » ky nang
so sanh » do sanh
co hoi » co hoc, co loi
cua tu » cua tuc, cua su, cua cu

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) or (so sanh)) ((thi nang) or (ki nang)) co hoi. hieu va pham thuc va van tai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((so sach) OR (so sanh)) ((thi nang) OR (ki nang)) co hoi. hieu va pham thuc va van tai cua tu.
• Adding a wildcard symbol may retrieve word variants: ((so sach) or (so sanh)) ((thi nang) or (ki nang)) co hoi. hieu va pham thuc va van tai cua tu*.