Perhaps you should try some spelling variations:
hanh ket » thanh ket, hanh kem, doanh ket
te sach » toc sach
sach ky » sac ky, sach y, sach ty
nang xa » nang x, lang xa, nang ma
hieu va » hieu qua
cam duc » cam xuc, cao duc, nam duoc
va hanh » van hanh, va thanh, va danh
ket hoa » ket hop

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 ky nang xa hoi. ((lieu va) or (hieu va)) ((cam duc) OR (pham duc)) va hanh ket hoa viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky nang xa hoi. ((lieu va) OR (hieu va)) ((cam duc) OR (pham duc)) va hanh ket hoa viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky nang xa hoi. ((lieu va) or (hieu va)) ((cam duc) OR (pham duc)) va hanh ket hoa viet".
• Adding a wildcard symbol may retrieve word variants: te sach ky nang xa hoi. ((lieu va) or (hieu va)) ((cam duc) OR (pham duc)) va hanh ket hoa viet*.