Perhaps you should try some spelling variations:
tinh tien » trinh tien, tinh dien, minh tien
hieu van » thien van, hieu ve
tien cua » trien cua, tiep cua, dien cua
cua viet » ca viet, hoa viet, cua vat
cao hoc » co hoc, cho hoc, chat hoc
hieu va » hieu qua
nam luc » nang luc, nhan luc, nam thuc
va tinh » may tinh
tu sac » tu sach, tu cac, tu san
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: tu sac ky nang cao hoc. ((((hieu van) OR (hieu va))) or (lieu va)) nam luc va tinh tien cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sac ky nang cao hoc. ((((hieu van) OR (hieu va))) OR (lieu va)) nam luc va tinh tien cua viet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sac ky nang cao hoc. ((((hieu van) OR (hieu va))) or (lieu va)) nam luc va tinh tien cua viet".
• Adding a wildcard symbol may retrieve word variants: tu sac ky nang cao hoc. ((((hieu van) OR (hieu va))) or (lieu va)) nam luc va tinh tien cua viet*.