Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
van hanh » van thanh, ban hanh, van anh
thu sach » thuoc sach, thu hoach, khau sach
tu sach » su sach, te sach, tu cach
tuc van » thuc van, truc van, tuc va
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va, hieu qua
hang xa » hoang xa, hang va, hang ca
ty hang » ly hang, ty xang, thi hang
va cam » va cham, va cac, va cao
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 (((thu sach) OR (thuat sach)))) ty hang xa hoi. hieu va cam tuc van hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (((thu sach) OR (thuat sach)))) ty hang xa hoi. hieu va cam tuc van hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) or (((thu sach) OR (thuat sach)))) ty hang xa hoi. hieu va cam tuc van hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) or (((thu sach) OR (thuat sach)))) ty hang xa hoi. hieu va cam tuc van hanh vi cua te*.