Perhaps you should try some spelling variations:
toc sach » hoc sach, thuoc sach, nuoc sach
hieu van » hieu va, thien van, lieu va
doc sach » hoc sach, nuoc sach, dac sac
va thanh » gia thanh, ban thanh, va tinh
va hanh » van hanh, va danh, ban hanh
van cam » van nam, van lam, van cau
cu tren » tu tren, dua tren
nang xa » nang x, lang xa, nang ma
y nang » ky nang, ly nang, v nang
vi cu » vi su, vi xu, vi du

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)) y nang xa hoi. hieu van cam xuc ((va hanh) or (va thanh)) vi cu tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((toc sach) OR (doc sach)) y nang xa hoi. hieu van cam xuc ((va hanh) OR (va thanh)) vi cu tren.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((toc sach) OR (doc sach)) y nang xa hoi. hieu van cam xuc ((va hanh) or (va thanh)) vi cu tren".
• Adding a wildcard symbol may retrieve word variants: ((toc sach) OR (doc sach)) y nang xa hoi. hieu van cam xuc ((va hanh) or (va thanh)) vi cu tren*.