Perhaps you should try some spelling variations:
cam thue » cam thu, lam thue, nam thue
thai xu » thai cua
thai su » tai su, thap su, thoi su
va nang » van nang, da nang, cam nang
thue va » thuc va, thuyet va, thuc vat
tu sach » thu sach, te sach, tu cach
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
su sach » so sach, vu sach
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (su sach)) ty nang xa hoi. hieu va cam thue va nang ((thai su) OR (thai xu)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (su sach)) ty nang xa hoi. hieu va cam thue va nang ((thai su) OR (thai xu)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (su sach)) ty nang xa hoi. hieu va cam thue va nang ((thai su) OR (thai xu)) triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (su sach)) ty nang xa hoi. hieu va cam thue va nang ((thai su) OR (thai xu)) triet*.