Perhaps you should try some spelling variations:
va thanh » gia thanh, ban thanh, va tinh
chon loc » cho hoc
vinh cuu » sinh cua, dinh cu, tinh cua
dinh cuu » dinh chi
hieu ve » hieu va, hieu van
ve chon » ve chong, ve cho, ve chuong
loc va » hoc va, luc va
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 cac ky nang ((o hoi) or (x ho)). hieu ve chon loc va thanh ((vinh cuu) OR (dinh cuu)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky nang ((o hoi) OR (x ho)). hieu ve chon loc va thanh ((vinh cuu) OR (dinh cuu)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky nang ((o hoi) or (x ho)). hieu ve chon loc va thanh ((vinh cuu) OR (dinh cuu)) tre".
• Adding a wildcard symbol may retrieve word variants: tu cac ky nang ((o hoi) or (x ho)). hieu ve chon loc va thanh ((vinh cuu) OR (dinh cuu)) tre*.