Perhaps you should try some spelling variations:
te sach » toc sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cao hoi » cau hoi, co hoi, cao hoc
hieu va » lieu va, hieu qua
cam duc » cao duc, pham duc, nam duoc
dau cua » day cua, cau cua, dan cua
va dau » va dao

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 cao hoi. hieu va ((cam duc) OR (cam xuc)) va dau ((dau cua) or (dai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang cao hoi. hieu va ((cam duc) OR (cam xuc)) va dau ((dau cua) OR (dai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang cao hoi. hieu va ((cam duc) OR (cam xuc)) va dau ((dau cua) or (dai cua)) te".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang cao hoi. hieu va ((cam duc) OR (cam xuc)) va dau ((dau cua) or (dai cua)) te*.