Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
ban thanh » ban hanh, ban hang
cau thuc » cau truc, cuu thuc, can thuc
va thanh » gia thanh, va tinh, le thanh
nang xa » nang x, lang xa, nang ma
hieu ve » hieu van
hieu va » lieu va, hieu qua
di cua » dai cua, doi cua, de cua
y nang » ky nang, ly nang, v nang
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach y nang xa hoi. ((hieu ve) or (hieu va)) cau thuc ((va thanh) OR (ban thanh)) di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach y nang xa hoi. ((hieu ve) OR (hieu va)) cau thuc ((va thanh) OR (ban thanh)) di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach y nang xa hoi. ((hieu ve) or (hieu va)) cau thuc ((va thanh) OR (ban thanh)) di cua te".
• Adding a wildcard symbol may retrieve word variants: thuat sach y nang xa hoi. ((hieu ve) or (hieu va)) cau thuc ((va thanh) OR (ban thanh)) di cua te*.