Perhaps you should try some spelling variations:
thieu nang » thien nang, thieu khang, thieu quang
dinh vai » dinh van, dinh vi, dinh va
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
hieu va » hieu qua
phap tu » phan tu, pham tu
va dinh » van dinh, va kinh, va tinh
tu tren » tu truyen, tu tieng, tu trong
vai tu » tai tu, mai tu, cai tu

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 thieu nang xa hoi. ((hieu ve) or (((hieu va) OR (lieu va)))) phap tu va dinh vai tu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach thieu nang xa hoi. ((hieu ve) OR (((hieu va) OR (lieu va)))) phap tu va dinh vai tu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach thieu nang xa hoi. ((hieu ve) or (((hieu va) OR (lieu va)))) phap tu va dinh vai tu tren".
• Adding a wildcard symbol may retrieve word variants: tu sach thieu nang xa hoi. ((hieu ve) or (((hieu va) OR (lieu va)))) phap tu va dinh vai tu tren*.