Perhaps you should try some spelling variations:
hoc nganh » hoc nhanh
nang van » dang van, tang van, lang van
hanh hai » thanh hai, nhanh hai, hang hai
cua tre » cua te, cua triet, dua tren
cuu tre » cau tren, cau treo
hieu ve » hieu va, hieu van
van hoi » van hoa, van hoc, van hoe
y nang » ky nang, ly nang, v nang
ve cac » va cac, vien cac

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc nganh y nang van hoi. hieu ve cac ((duc va) or (day va)) hanh hai ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc nganh y nang van hoi. hieu ve cac ((duc va) OR (day va)) hanh hai ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc nganh y nang van hoi. hieu ve cac ((duc va) or (day va)) hanh hai ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: hoc nganh y nang van hoi. hieu ve cac ((duc va) or (day va)) hanh hai ((cua tre) OR (cuu tre))*.