Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
trinh ve » trinh he, trinh va, trinh vi
hieu va » lieu va, hieu qua
ky tang » ky nang, ky dang, kho tang
tang ma » mang may, tang van
ma hoi » mai hoi, xa hoi, ma hoa
va cau » van cau, va cac, va dau
san ky » sang ky, van ky, dan ky
luc va » duc va, tuc va
loc va » hoc va
ve cau » ke cau, ve cac, le cau
te san » te ban, ke san, tu san

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

• Performing a fuzzy search may retrieve terms with similar spellings: te san ky tang ma hoi. hieu va cau ((luc va) or (loc va)) trinh ve cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te san ky tang ma hoi. hieu va cau ((luc va) OR (loc va)) trinh ve cau tren.
• Adding a wildcard symbol may retrieve word variants: te san ky tang ma hoi. hieu va cau ((luc va) or (loc va)) trinh ve cau tren*.