Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
thien van » thi van
va thieu » va thiet, va hieu, va tieu
thu sach » thuat sach, thuoc sach, thu hoach
van pham » san pham, van phan, van phat
dan mai » doan mai, ban mai, dan tai
thuc va » thuc vat, thuc dan, thuc day
tu sach » su sach, te sach, tu cach
cao hoi » cau hoi, co hoi, tao hoi
cao hoc » co hoc, cho hoc, chat hoc
va dan » ca dan, va dao, va dau

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 (thu sach)) ky nang ((cao hoi) or (cao hoc)). thien van pham thuc va dan mai va thieu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) ky nang ((cao hoi) OR (cao hoc)). thien van pham thuc va dan mai va thieu.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thu sach)) ky nang ((cao hoi) or (cao hoc)). thien van pham thuc va dan mai va thieu*.