Perhaps you should try some spelling variations:
thanh kem » hanh kem, thanh ke, thanh ket
va thanh » gia thanh, ban thanh, va tinh
cu tren » tu tren, dua tren
ca tren » cau tren, la tren, co tren
hieu ve » hieu va, hieu van
cam tuc » cam xuc, cam tu, nam thuc
nang xa » lang xa, nang ma, mang xa
ve cam » ve cham, ve cac, va cam
dan ky » van ky
tuc va » thuc va, truc va, tuc xa
tu dan » tuc dan, tu ban, cu dan

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu dan ky ((nang xa) or (nang x)) hoi. hieu ve cam tuc va thanh kem ((ca tren) OR (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu dan ky ((nang xa) OR (nang x)) hoi. hieu ve cam tuc va thanh kem ((ca tren) OR (cu tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu dan ky ((nang xa) or (nang x)) hoi. hieu ve cam tuc va thanh kem ((ca tren) OR (cu tren))".
• Adding a wildcard symbol may retrieve word variants: tu dan ky ((nang xa) or (nang x)) hoi. hieu ve cam tuc va thanh kem ((ca tren) OR (cu tren))*.