Perhaps you should try some spelling variations:
thuat san » thuat toan, thuat song, thuat lanh
thuoc dac » thuoc dang, thuoc sach, thuc dan
thuoc da » thuoc ma, thuoc va, thuoc la
tu sach » thu sach, su sach, te sach
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
hieu va » lieu va, hieu qua
vi cua » vai cua, di cua
va nam » van nam, ha nam, va nay
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 ((thuoc da) OR (thuoc 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 ((thuoc da) OR (thuoc 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 ((thuoc da) OR (thuoc 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 ((thuoc da) OR (thuoc dac)) hanh vi cua te*.