Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
tinh ven » trinh ven, tinh yen, sinh vien
san kho » san khoa, san cho, san ho
tinh ve » trinh ve, dinh ve, tinh va
cam luc » cam xuc, cau luc
qua cam » qua cham, qua cac, qua ca
tang xa » trang xa, tang ma, lang xa
lan kho » lam kho, lan cho, van kho
luc va » duc va, tuc va, loc va

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

• If you are trying to use Boolean operators, they must be ALL CAPS: te ((san kho) OR (lan kho)) tang xa hoi. hieu qua cam luc va ((tinh ve) OR (tinh ven)) cau tren~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((san kho) OR (lan kho)) tang xa hoi. hieu qua cam luc va ((tinh ve) or (tinh ven)) cau tren~".
• Adding a wildcard symbol may retrieve word variants: te ((san kho) OR (lan kho)) tang xa hoi. hieu qua cam luc va ((tinh ve) or (tinh ven)) cau tren*.