Perhaps you should try some spelling variations:
dang xay » dang van, van xay
cua viet » hoa viet, cua vat, cua dieu
so sanh » do sanh
va hanh » van hanh, va thanh, va danh
cam tuc » cam xuc, cam tu, nam thuc
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
ca viet » va viet, co viet, hoa viet
sanh y » sinh y, anh y, hanh y
ve cam » ve cham, ve cac, va cam
tuc va » thuc va, truc va, tuc xa

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh y ((nang ma) or (dang xay)) hoi. hieu ve cam tuc va hanh vi ((cua viet) OR (ca viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh y ((nang ma) OR (dang xay)) hoi. hieu ve cam tuc va hanh vi ((cua viet) OR (ca viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh y ((nang ma) or (dang xay)) hoi. hieu ve cam tuc va hanh vi ((cua viet) OR (ca viet))".
• Adding a wildcard symbol may retrieve word variants: so sanh y ((nang ma) or (dang xay)) hoi. hieu ve cam tuc va hanh vi ((cua viet) OR (ca viet))*.