Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cam luc » cau luc
tinh ve » trinh ve, tinh ven, dinh ve
cau tre » cau tren, cau treo, cau tra
ve cau » ke cau, va cau, ve cac

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

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