Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
doc sach » hoc sach, nuoc sach, bo sach
qua tham » qua cham, qua than, qua thanh
tham luc » than luc, tham nuoc, tham thuc
van hanh » van thanh, ban hanh, van anh
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
luc van » luoc van, luu van, duc van
hanh di » hanh vi, hanh de, hang di
di cua » dai cua, doi cua, de 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: ((toc sach) or (((doc sach) or (dac sac)))) ky tang xa hoi. hieu qua tham luc van hanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (((doc sach) OR (dac sac)))) ky tang xa hoi. hieu qua tham luc van hanh di cua te.
• Adding a wildcard symbol may retrieve word variants: ((toc sach) or (((doc sach) or (dac sac)))) ky tang xa hoi. hieu qua tham luc van hanh di cua te*.