Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
hieu van » hieu va, thien van, lieu va
dua tren » dung tren
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
nang xa » nang x, lang xa, nang ma
dao duc » giao duc, tao duoc
va hanh » van hanh, va thanh, va danh
cua tre » cuu tre, cua triet, cua thep
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat sach ty nang xa hoi. hieu van dao duc va hanh vi ((((cua tre) OR (dua tren))) or (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ty nang xa hoi. hieu van dao duc va hanh vi ((((cua tre) OR (dua tren))) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ty nang xa hoi. hieu van dao duc va hanh vi ((((cua tre) OR (dua tren))) or (cua te))".
• Adding a wildcard symbol may retrieve word variants: thuat sach ty nang xa hoi. hieu van dao duc va hanh vi ((((cua tre) OR (dua tren))) or (cua te))*.