Perhaps you should try some spelling variations:
cua viet » ca viet, hoa viet, cua vat
hanh vai » hanh vi, hanh tai, hanh van
cam truc » cau truc, nam truc, lam truoc
hanh va » hang va, hanh vi
truc va » thuc va, thuc vat, trung va
so sanh » do sanh
hieu ve » hieu va, hieu van
ky tang » ky nang, ky dang, kho tang
ma hoi » mai hoi, xa hoi, ma hoa
y tang » 6 tang, 7 tang, 5 tang
ve cam » ve cham, ve cac, va cam

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 tang) or (ky tang)) ma hoi. hieu ve cam truc va ((hanh vai) OR (hanh va)) cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ((y tang) OR (ky tang)) ma hoi. hieu ve cam truc va ((hanh vai) OR (hanh va)) cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so sanh ((y tang) or (ky tang)) ma hoi. hieu ve cam truc va ((hanh vai) OR (hanh va)) cua viet".
• Adding a wildcard symbol may retrieve word variants: so sanh ((y tang) or (ky tang)) ma hoi. hieu ve cam truc va ((hanh vai) OR (hanh va)) cua viet*.