Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
hieu van » hieu va, thien van, lieu va
van chat » cao chat
tu sach » su sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
hanh di » hanh vi, hanh de, hang di
cu tren » tu tren, dua tren
y nang » ky nang, ly nang, v nang
luc va » tuc va, loc va
di cu » di cau, di cua, di du

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

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