Perhaps you should try some spelling variations:
van hanh » van thanh, ban hanh, van anh
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
hau luc » hau loc, cau luc, nhan luc
luc van » luoc van, luu van, duc van
hanh le » thanh le, hanh ve, hanh de
cua tre » cua te, cuu tre, cua triet
sach v » sach va, sach y, sach vay
sach 2 » sach y
va hau » van hau, va chau, vat hau
le cua » ly cua

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

• Performing a fuzzy search may retrieve terms with similar spellings: te ((sach v) OR (sach 2)) nang xa hoi. hieu va hau luc van hanh le cua tre~.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te ((sach v) OR (sach 2)) nang xa hoi. hieu va hau luc van hanh le cua tre".
• Adding a wildcard symbol may retrieve word variants: te ((sach v) OR (sach 2)) nang xa hoi. hieu va hau luc van hanh le cua tre*.