Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
nang ma » tang ma, sang ma, nang cao
qua hai » qua hoat
danh ve » dinh ve, hanh ve, anh ve
truc va » thuc va, thuc vat, trung va
ve cau » ke cau, va cau, ve cac
su can » su van, su cao, tu can
luc va » duc va, tuc va, loc va
can ky » van ky, dan ky, ban ky
xac va » tac va, ac va, bac va
ma hoi » mai hoi, xa hoi, ma hoa

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

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