Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
cham luc » nhan luc, cham cuu, chat lua
thanh vi » hanh vi, thanh va, thanh ve
tang ma » mang may, tang van
hieu va » lieu va, hieu qua
luu tre » luu tru, cuu tre, luy tre
te cac » tu cac, ve cac, te cao
vi luu » vi lua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te cac ky ((nang x) or (tang ma)) hoi. hieu va ((cham luc) OR (cham soc)) van thanh vi luu tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te cac ky ((nang x) OR (tang ma)) hoi. hieu va ((cham luc) OR (cham soc)) van thanh vi luu tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te cac ky ((nang x) or (tang ma)) hoi. hieu va ((cham luc) OR (cham soc)) van thanh vi luu tre".
• Adding a wildcard symbol may retrieve word variants: te cac ky ((nang x) or (tang ma)) hoi. hieu va ((cham luc) OR (cham soc)) van thanh vi luu tre*.