Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
va cham » va chat, va tham
truc va » thuc va, thuc vat, trung va
danh vi » hanh vi, dinh vi, danh di
su sac » su sach, su cac, su xac
sac ky » cac ky, sai ky
vi cau » va cau, ve cau, di cau

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sac ky ((nang x) or (nang ma)) hoi. hieu va cham ((truc va) or (duc va)) danh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sac ky ((nang x) OR (nang ma)) hoi. hieu va cham ((truc va) OR (duc va)) danh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: su sac ky ((nang x) or (nang ma)) hoi. hieu va cham ((truc va) or (duc va)) danh vi cau tren*.