Perhaps you should try some spelling variations:
te sach » toc sach
sach ty » sach y, sach tu, sach thu
va hanh » van hanh, va thanh, va danh
hieu va » hieu qua
ty nang » ky nang, ty xang, ty hang
nam tu » nam thu, nam thuc
di cuu » di cua, dinh cuu
di cau » da cau, diem cau
x hoi » xa hoi, o hoi, x ho

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 x hoi. ((hieu va) or (lieu va)) nam tu va hanh ((di cuu) OR (di cau)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang x hoi. ((hieu va) OR (lieu va)) nam tu va hanh ((di cuu) OR (di cau)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang x hoi. ((hieu va) or (lieu va)) nam tu va hanh ((di cuu) OR (di cau)) tre".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang x hoi. ((hieu va) or (lieu va)) nam tu va hanh ((di cuu) OR (di cau)) tre*.