Perhaps you should try some spelling variations:
hoc sach » hoc sinh, hoc anh
va thanh » gia thanh, ban thanh, va tinh
hoc cac » hoc cao
nang xa » nang x, lang xa, nang ma
nam tuc » nam thuc, nam truc, nam tu
va nam » van nam, ha nam, va nay
tuc va » thuc va, truc va, tuc xa
do van » dao van, vo van, so van
do va » so va

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((hoc sach) or (hoc cac)) ky nang xa hoi. lieu va nam tuc va thanh ((do va) OR (do van)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (hoc cac)) ky nang xa hoi. lieu va nam tuc va thanh ((do va) OR (do van)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) or (hoc cac)) ky nang xa hoi. lieu va nam tuc va thanh ((do va) OR (do van)) triet".
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) or (hoc cac)) ky nang xa hoi. lieu va nam tuc va thanh ((do va) OR (do van)) triet*.