Perhaps you should try some spelling variations:
cau tren » cu tren, dau tren, ca tren
cham duc » pham duc, cham soc, pham duy
hieu va » lieu va, hieu qua
hanh va » hang va, hanh vi
duc van » duc va, duc tan, duc manh
hieu ve » hieu van
sac ky » cac ky, sai ky
nang o » nang co, nang ho, nang ro
tu sac » tu sach, tu cac, tu san
o hoi » co hoi, o hoc, o hai

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sac ky nang o hoi. ((hieu ve) or (hieu va)) cham duc van ((anh va) or (hanh va)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang o hoi. ((hieu ve) OR (hieu va)) cham duc van ((anh va) OR (hanh va)) cau tren.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang o hoi. ((hieu ve) or (hieu va)) cham duc van ((anh va) or (hanh va)) cau tren*.