Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
hoc sach » hoc sinh, hoc cac, hoc anh
van hanh » ban hanh, van anh, van ban
cam loc » cam lo
hieu va » lieu va, hieu qua
lang xa » lang ha, dang xay, lang van
ky lang » ky nang, ky dang, ky tang
te sach » toc sach
va cam » va cham, va cac, va cao
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: ((hoc sach) or (te sach)) ky lang xa hoi. hieu va cam loc ((van hanh) OR (van thanh)) tri cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((hoc sach) OR (te sach)) ky lang xa hoi. hieu va cam loc ((van hanh) OR (van thanh)) tri cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((hoc sach) or (te sach)) ky lang xa hoi. hieu va cam loc ((van hanh) OR (van thanh)) tri cua te".
• Adding a wildcard symbol may retrieve word variants: ((hoc sach) or (te sach)) ky lang xa hoi. hieu va cam loc ((van hanh) OR (van thanh)) tri cua te*.