Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
dan hanh » dang hanh, dan khanh, dan thanh
nam thuc » nam thuoc, am thuc, nam thu
thi van » thi lan, thi hanh, thi nang
ly nang » ky nang, ly hang, ly vang
tu sach » thu sach, su sach, te sach
y nang » ky nang, v nang, may nang
doi va » hoi va, noi va
dai va » mai va

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 ((y nang) or (ly nang)) xa hoi. thi van nam thuc dan hanh ((doi va) OR (dai va)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((y nang) OR (ly nang)) xa hoi. thi van nam thuc dan hanh ((doi va) OR (dai va)) triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((y nang) or (ly nang)) xa hoi. thi van nam thuc dan hanh ((doi va) OR (dai va)) triet".
• Adding a wildcard symbol may retrieve word variants: tu sach ((y nang) or (ly nang)) xa hoi. thi van nam thuc dan hanh ((doi va) OR (dai va)) triet*.