Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
cau thuc » cau truc, cuu thuc, can thuc
thuc dan » thuc hanh, hoc dan, thuc vat
dan hanh » dang hanh, dan khanh, dan thanh
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
hanh ca » hanh cac, hanh cat, hanh cua
y nang » ky nang, ly nang, v nang
cua tu » cua tuc, cua cu, cua te
cua su » qua su

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