Perhaps you should try some spelling variations:
cham luc » cham soc, nhan luc, cham cuu
dat cua » dai cua, day cua, mat cua
dau dat » dan dat, dau da, dau mat
va cham » va chat, va tham
hieu va » lieu va, hieu qua
te sach » toc sach
ky tang » ky nang, ky dang, kho tang
ky sang » ky nang, ky dang, duy sang
ma hoi » mai hoi, ma hoa, me hoi
luc va » duc va, tuc va, loc va
va dau » va dao
cua te » cua tu

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 ((ky sang) or (ky tang)) ((ma hoi) OR (xa hoi)). hieu va cham luc va dau dat cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ky sang) OR (ky tang)) ((ma hoi) OR (xa hoi)). hieu va cham luc va dau dat cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ky sang) or (ky tang)) ((ma hoi) OR (xa hoi)). hieu va cham luc va dau dat cua te".
• Adding a wildcard symbol may retrieve word variants: te sach ((ky sang) or (ky tang)) ((ma hoi) OR (xa hoi)). hieu va cham luc va dau dat cua te*.