Perhaps you should try some spelling variations:
chieu chien » thien chien
hieu hien » bieu hien, dieu hien, dieu khien
vai cua » hai cua, lai cua, bai cua
va hanh » van hanh, va thanh, va danh
vu sach » vu bach, su sach, vu khach
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
cac lo » cac lop, cac co, cac bo
lo va » lo van, lao va, ly va

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

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ty nang xa hoi. ((hieu hien) or (chieu chien)) cac lo va hanh ((vai cua) OR (dai cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ty nang xa hoi. ((hieu hien) OR (chieu chien)) cac lo va hanh ((vai cua) OR (dai cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ty nang xa hoi. ((hieu hien) or (chieu chien)) cac lo va hanh ((vai cua) OR (dai cua)) te".
• Adding a wildcard symbol may retrieve word variants: vu sach ty nang xa hoi. ((hieu hien) or (chieu chien)) cac lo va hanh ((vai cua) OR (dai cua)) te*.