Perhaps you should try some spelling variations:
can thuc » dan thuc, van thuc, cay thuc
thuc dan » thuc hanh, hoc dan, thuc vat
dan hanh » dang hanh, dan khanh, dan thanh
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
y nang » ky nang, ly nang, v nang
ve cua » de cua, te cua, ve cum
le cua » ly cua

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