Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
van hanh » van thanh, ban hanh, van anh
chat sat » khao sat, chat va, chat ban
hoc sach » hoc sinh, hoc cac, hoc anh
sat van » sat va, hat van, hoat van
va chat » van chat, va phat, cao chat
hieu va » lieu va, hieu qua
nang xa » nang x, lang xa, nang ma
ty nang » ky nang, ty xang, ty hang
tu sach » su sach, te sach, tu cach
ca tren » cau tren, cu tren, la tren
vi ca » vit ca, li ca, va ca

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

• Performing a fuzzy search may retrieve terms with similar spellings: ((((thu sach) or (tu sach))) or (hoc sach)) ty nang xa hoi. hieu va chat sat van hanh vi ca tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((((thu sach) OR (tu sach))) OR (hoc sach)) ty nang xa hoi. hieu va chat sat van hanh vi ca tren.
• Adding a wildcard symbol may retrieve word variants: ((((thu sach) or (tu sach))) or (hoc sach)) ty nang xa hoi. hieu va chat sat van hanh vi ca tren*.