Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
danh vi » hanh vi, dinh vi, danh di
qua hai » qua hoat
nang ma » tang ma, sang ma, nang cao
ma hoi » mai hoi, xa hoi, ma hoa
xac va » tac va, ac va, bac va
tuc va » thuc va, truc va, tuc xa
su van » tu van, vu van
vi cau » va cau, ve cau, di cau
su can » su cao, tu can, su han

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) or (su van)) ky nang ma hoi. hieu qua hai ((xac va) or (tuc va)) danh vi cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su can) OR (su van)) ky nang ma hoi. hieu qua hai ((xac va) OR (tuc va)) danh vi cau tren.
• Adding a wildcard symbol may retrieve word variants: ((su can) or (su van)) ky nang ma hoi. hieu qua hai ((xac va) or (tuc va)) danh vi cau tren*.