Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
tu sach » thu sach, su sach, te sach
thu dac » thu duc, thu xac, thu dai
hieu va » lieu va, hieu qua
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
va nam » van nam, ha nam, va nay
thu da » thu dai, thu dau, thue da
vi cua » vai cua, di cua
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((tu sach) or (thuat san)) ky tang xa hoi. hieu va nam ((thu da) OR (thu dac)) hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thuat san)) ky tang xa hoi. hieu va nam ((thu da) OR (thu dac)) hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (thuat san)) ky tang xa hoi. hieu va nam ((thu da) OR (thu dac)) hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (thuat san)) ky tang xa hoi. hieu va nam ((thu da) OR (thu dac)) hanh vi cua te*.