Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
va thanh » gia thanh, ban thanh, va tinh
hieu van » hieu va, thien van, lieu va
va hanh » van hanh, va danh, ban hanh
van cam » van nam, van lam, van cau
nang xa » nang x, lang xa, nang ma
ly nang » ky nang, ly hang, ly vang
du tren » dua tren, dau tren, duc tren
vi du » vi dum, va du, ve du

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