Perhaps you should try some spelling variations:
trinh doc » trinh do, trinh hoa, trinh co
cua viet » ca viet, hoa viet, cua vat
tinh doi » trinh do, tinh hoc, tinh son
thuc day » thuc dan, thuc vat
ky lang » ky nang, ky dang, ky tang
lang xa » lang ha, dang xay, lang van
hieu ve » hieu van
hieu va » lieu va, hieu qua
te lai » te tai, te bai
lai ky » sai ky, dai ky

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

• Performing a fuzzy search may retrieve terms with similar spellings: te lai ky lang xa hoi. ((hieu ve) or (hieu va)) am thuc day ((tinh doi) or (trinh doc)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te lai ky lang xa hoi. ((hieu ve) OR (hieu va)) am thuc day ((tinh doi) OR (trinh doc)) cua viet.
• Adding a wildcard symbol may retrieve word variants: te lai ky lang xa hoi. ((hieu ve) or (hieu va)) am thuc day ((tinh doi) or (trinh doc)) cua viet*.