Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
hanh lai » hanh lam, hanh tai, thanh lap
nam thuc » nam thuoc, am thuc, nam thu
thi hanh » thi thanh
thi nang » thi cong, ki nang
qua nam » quan nam, cua nam, quang nam
vu sach » vu bach, su sach, vu khach
thuc va » thuc vat, thuc dan, thuc day
va hanh » van hanh, va thanh, va danh
tu sach » thu sach, su sach, te sach

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 (vu sach)) ((thi nang) or (thi hanh)) xa hoi. hieu qua nam thuc va hanh lai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (vu sach)) ((thi nang) OR (thi hanh)) xa hoi. hieu qua nam thuc va hanh lai su triet.
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (vu sach)) ((thi nang) or (thi hanh)) xa hoi. hieu qua nam thuc va hanh lai su triet*.