Perhaps you should try some spelling variations:
thuoc sach » hoc sach, nuoc sach, thuat sach
hieu van » hieu va, thien van, lieu va
luoc van » luoc can, luoc va, luot van
nang xa » nang x, lang xa, nang ma
van cam » van nam, van lam, van cau
luc van » luu van, duc van, luc va
vai cua » hai cua, lai cua, bai cua
y nang » ky nang, ly nang, v nang

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 y nang xa hoi. hieu van cam ((luc van) OR (luoc van)) thanh ((vai cua) or (dai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuoc sach y nang xa hoi. hieu van cam ((luc van) OR (luoc van)) thanh ((vai cua) OR (dai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuoc sach y nang xa hoi. hieu van cam ((luc van) OR (luoc van)) thanh ((vai cua) or (dai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thuoc sach y nang xa hoi. hieu van cam ((luc van) OR (luoc van)) thanh ((vai cua) or (dai cua)) tre*.