Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
va thanh » ban thanh, va tinh, le thanh
cam tuc » cam xuc, cam tu, nam thuc
hai cau » hai chau, hai chu, hai hau
te sach » toc sach
hieu va » lieu va, hieu qua
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, me hoi
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach y nang ((ma hoi) OR (ma hoa)). hieu va cam tuc ((va thanh) or (gia thanh)) hai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang ((ma hoi) OR (ma hoa)). hieu va cam tuc ((va thanh) OR (gia thanh)) hai cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang ((ma hoi) OR (ma hoa)). hieu va cam tuc ((va thanh) or (gia thanh)) hai cau tren".
• Adding a wildcard symbol may retrieve word variants: te sach y nang ((ma hoi) OR (ma hoa)). hieu va cam tuc ((va thanh) or (gia thanh)) hai cau tren*.