Perhaps you should try some spelling variations:
tinh binh » ninh binh, tinh ninh
tinh sinh » tinh ninh, tinh hinh, tinh son
cham loc » cham soc, chon loc, cham o
cau tren » cu tren, dau tren, ca tren
hieu vu » hieu va, hieu ve, hieu su
vu cham » va cham, vu kham, tu cham
mo hoc » mon hoc, co hoc
loc va » hoc va, luc 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 cac ky nang ((mo hoc) or (x ho)). hieu vu cham loc va ((tinh sinh) OR (tinh binh)) cau tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu cac ky nang ((mo hoc) OR (x ho)). hieu vu cham loc va ((tinh sinh) OR (tinh binh)) cau tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu cac ky nang ((mo hoc) or (x ho)). hieu vu cham loc va ((tinh sinh) OR (tinh binh)) cau tren".
• Adding a wildcard symbol may retrieve word variants: tu cac ky nang ((mo hoc) or (x ho)). hieu vu cham loc va ((tinh sinh) OR (tinh binh)) cau tren*.