Perhaps you should try some spelling variations:
thieu nang » thien nang, thieu khang, thieu quang
pham thuc » phap thuc, pham chuc, nham thuc
dinh vai » dinh van, dinh vi, dinh va
tu sach » thu sach, su sach, tu cach
va dinh » van dinh, va kinh, va tinh
thuc va » thuc vat, thuc dan, thuc day
cu tren » tu tren, dua tren
hieu ve » hieu va, hieu van
nang xa » nang x, lang xa, nang ma
te sach » toc sach
vai cu » vai cua, van cu

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