Perhaps you should try some spelling variations:
xach tay » canh tay
nam thuc » nam thuoc, am thuc, nam thu
dang mat » dang vat, dang mau, dung mat
nam truc » nam truoc, nam trung, nam thuoc
va hanh » van hanh, va thanh, va danh
hieu le » hieu ve, hieu he, hieu ly
mat hoi » mai hoi, sat hoi, mat troi
vi hoa » voi hoa, vi hoc, va hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: so ((xach tay) or (sach y)) dang mat hoi. hieu le ((nam truc) OR (nam thuc)) va hanh vi hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((xach tay) OR (sach y)) dang mat hoi. hieu le ((nam truc) OR (nam thuc)) va hanh vi hoa viet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((xach tay) or (sach y)) dang mat hoi. hieu le ((nam truc) OR (nam thuc)) va hanh vi hoa viet*".