Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
cau theo » cau thi, cau tao
hanh hai » thanh hai, nhanh hai, hang hai
sanh ly » sinh ly, doanh ly, khanh ly
va hanh » van hanh, va thanh, va danh
so sanh » do sanh
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ly nang » ky nang, ly hang, ly vang
cam tuc » cam xuc, cam tu, nam thuc
va cam » va cham, va cac, va cao
tuc va » thuc va, truc va, tuc xa
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: so sanh ly nang ma hoi. hieu va cam tuc va hanh hai ((cau theo) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh ly nang ma hoi. hieu va cam tuc va hanh hai ((cau theo) OR (cau tren)).
• Adding a wildcard symbol may retrieve word variants: so sanh ly nang ma hoi. hieu va cam tuc va hanh hai ((cau theo) or (cau tren))*.