Perhaps you should try some spelling variations:
hieu vien » hieu hien, thieu nien, hieu tieng
hieu viec » nhieu viec, hieu ve, sieu viet
te sach » toc sach
va dinh » van dinh, va tinh, vu dinh
hai cua » thai cua, dai cua, hoi cua
va kinh » va tinh, qua kinh
dai lan » dai luan, dai han, dam lan
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang
cua tu » cua tuc, cua su, cua cu

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 y nang xa hoi. ((hieu vien) or (hieu viec)) dai lan ((va dinh) OR (va kinh)) hai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach y nang xa hoi. ((hieu vien) OR (hieu viec)) dai lan ((va dinh) OR (va kinh)) hai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach y nang xa hoi. ((hieu vien) or (hieu viec)) dai lan ((va dinh) OR (va kinh)) hai cua tu".
• Adding a wildcard symbol may retrieve word variants: te sach y nang xa hoi. ((hieu vien) or (hieu viec)) dai lan ((va dinh) OR (va kinh)) hai cua tu*.