Perhaps you should try some spelling variations:
cua viet » hoa viet, cua vat, cua dieu
trung va » truong va, trang va, trung ha
so sinh » so sanh, so tinh, cho sinh
hanh di » hanh vi, hanh de, hang di
ca viet » va viet, co viet, hoa viet
truc va » thuc va, thuc vat
hieu ve » hieu va, hieu van
nang ma » tang ma, sang ma, nang cao
sinh y » sinh ly
ve cam » ve cham, ve cac, va cam
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, ly nang, v nang

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

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