Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh hai » thanh hai, nhanh hai, hang hai
thi nang » thi cong, thi hanh
nam thuc » nam thuoc, am thuc, nam thu
hai cua » thai cua, dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
tu sach » thu sach, te sach, tu cach
ki nang » ky nang
su sach » so sach, vu sach
va nam » van nam, ha nam, va nay

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