Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
vu khach » vu khanh, vu khac, vay khach
van hanh » van thanh, ban hanh, van anh
va cham » va chat, va tham
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
tuc van » thuc van, truc van, tuc va
vi cua » vai cua, di cua
cua te » cua tu
va co » vo co

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((thuoc sach) or (vu khach)) ky tang xa hoi. hieu ((va co) or (va cham)) tuc van hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((thuoc sach) OR (vu khach)) ky tang xa hoi. hieu ((va co) OR (va cham)) tuc van hanh vi cua te.
• Adding a wildcard symbol may retrieve word variants: ((thuoc sach) or (vu khach)) ky tang xa hoi. hieu ((va co) or (va cham)) tuc van hanh vi cua te*.