Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
danh vai » danh sai, danh va, doanh van
cham cuu » cap cuu, chat cua
cham luc » cham soc, nhan luc, chat lua
vai cau » va cau, van cau, vai cac
va danh » va dinh, va dan, va hanh
te sach » toc sach
hieu su » hieu sau, tieu su, hieu so
ly hang » ly quang
ty hang » ty xang, thi hang, thu hang

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 hang) or (ly hang)) xa hoi. hieu su ((cham luc) OR (cham cuu)) va danh vai cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ((ty hang) OR (ly hang)) xa hoi. hieu su ((cham luc) OR (cham cuu)) va danh vai cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ((ty hang) or (ly hang)) xa hoi. hieu su ((cham luc) OR (cham cuu)) va danh vai cau tren".
• Adding a wildcard symbol may retrieve word variants: te sach ((ty hang) or (ly hang)) xa hoi. hieu su ((cham luc) OR (cham cuu)) va danh vai cau tren*.