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

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