Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
hieu van » hieu va, thien van, lieu va
dang van » hoang van, hang va
ly nang » ky nang, ly hang, ly vang
van hac » van hoc, van ha, van hai
dao van » do van
ma hoi » mai hoi, xa hoi, ma hoa
y nang » ky nang, v nang, may nang
vi cua » vai cua, di cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat san ((y nang) or (ly nang)) ma hoi. hieu van hac ((dao van) OR (dang van)) hanh vi cua vat~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat san ((y nang) OR (ly nang)) ma hoi. hieu van hac ((dao van) OR (dang van)) hanh vi cua vat.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat san ((y nang) or (ly nang)) ma hoi. hieu van hac ((dao van) OR (dang van)) hanh vi cua vat".
• Adding a wildcard symbol may retrieve word variants: thuat san ((y nang) or (ly nang)) ma hoi. hieu van hac ((dao van) OR (dang van)) hanh vi cua vat*.