Perhaps you should try some spelling variations:
trinh doc » trinh do, trinh hoa, trinh co
cua viet » ca viet, hoa viet, cua vat
dang tay » dang xay, dung tay, dan tay
tinh doi » trinh do, tinh hoc, tinh son
thuc va » thuc vat, thuc dan, thuc day
hieu va » lieu va, hieu qua
tay hoi » tay ho, tao hoi, tay thai
hieu ve » hieu van
ky dang » ky nang, ky danh
lai ky » sai ky, dai ky
te lai » te tai, te bai

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 dang tay hoi. ((hieu ve) or (hieu va)) am thuc va ((tinh doi) OR (trinh doc)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te lai ky dang tay hoi. ((hieu ve) OR (hieu va)) am thuc va ((tinh doi) OR (trinh doc)) cua viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te lai ky dang tay hoi. ((hieu ve) or (hieu va)) am thuc va ((tinh doi) OR (trinh doc)) cua viet*".