Perhaps you should try some spelling variations:
dat tren » dat trong, dua tren
dau tren » dau tien, dau tieng, dau trong
va cham » va chat, va tham
vu cham » vu kham, tu cham, qua cham
va hanh » van hanh, va thanh, va danh
hanh ve » hanh vi, hanh va, hanh kem
nang co » nang cao, nang doc, nang noi
thu sac » thu sach, thu san, thu xac
sac ky » cac ky, sai ky
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sac ky nang co hoc. hieu ((va cham) or (vu cham)) luc va hanh ve ((dau tren) OR (dat tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sac ky nang co hoc. hieu ((va cham) OR (vu cham)) luc va hanh ve ((dau tren) OR (dat tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sac ky nang co hoc. hieu ((va cham) or (vu cham)) luc va hanh ve ((dau tren) OR (dat tren))".
• Adding a wildcard symbol may retrieve word variants: thu sac ky nang co hoc. hieu ((va cham) or (vu cham)) luc va hanh ve ((dau tren) OR (dat tren))*.