Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
hoc sac » hoc sach, hoc mac, hoc sau
cam tuc » cam xuc, cam tu, nam thuc
via cua » gia cua, gian cua, giau cua
hoc cac » hoc cao
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
dan via » dan va, dan gia, dan gian
va dan » ca dan, va dao, va dau
tuc va » thuc va, truc va, tuc xa
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: ((hoc sac) or (hoc cac)) ky nang xa hoi. ((hieu va) or (hieu van)) cam tuc va dan via cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sac) OR (hoc cac)) ky nang xa hoi. ((hieu va) OR (hieu van)) cam tuc va dan via cua te.
• Adding a wildcard symbol may retrieve word variants: ((hoc sac) or (hoc cac)) ky nang xa hoi. ((hieu va) or (hieu van)) cam tuc va dan via cua te*.