Perhaps you should try some spelling variations:
thieu nang » thien nang, thieu khang, thieu quang
phap thuc » phap thu, phap hoc, phap tu
thu sach » tu sach, thuat sach, thuoc sach
dinh vai » dinh van, dinh vi, dinh va
hieu va » lieu va, hieu qua
va dinh » van dinh, va kinh, va tinh
thuc va » thuc vat, thuc dan, thuc day
tu tren » tu truyen, tu tieng, tu trong
hieu ve » hieu van
te sach » toc sach
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: ((thu sach) or (te sach)) thieu nang x ho. ((hieu ve) or (hieu va)) phap thuc va dinh vai tu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thu sach) OR (te sach)) thieu nang x ho. ((hieu ve) OR (hieu va)) phap thuc va dinh vai tu tren.
• Adding a wildcard symbol may retrieve word variants: ((thu sach) or (te sach)) thieu nang x ho. ((hieu ve) or (hieu va)) phap thuc va dinh vai tu tren*.