Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
dau tren » dau tien, dat tren, dau tieng
thanh va » thanh van, hanh va, thanh ha
cham duc » pham duc, cham soc, pham duy
hieu ve » hieu van
duc van » duc va, duc tan, duc manh
hieu va » lieu va, hieu qua
va dau » va dao
tu sac » tu sach, tu cac, tu san
sac ky » cac ky, sai ky
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) or (x ho)). ((hieu ve) or (hieu va)) cham duc van thanh va dau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang ((o hoi) OR (x ho)). ((hieu ve) OR (hieu va)) cham duc van thanh va dau tren.
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang ((o hoi) or (x ho)). ((hieu ve) or (hieu va)) cham duc van thanh va dau tren*.