Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
cham loc » cham soc, chon loc, cham o
nang xa » nang x, lang xa, nang ma
hieu vu » hieu ve, hieu su, dieu vu
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
va dinh » van dinh, va kinh, va tinh
cua tre » cua te, cuu tre, cua triet
va dan » ca dan, va dao, va dau
vi cua » vai cua, di cua

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 ky nang xa hoi. ((hieu vu) OR (hieu va)) cham loc ((va dinh) or (va dan)) vi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ky nang xa hoi. ((hieu vu) OR (hieu va)) cham loc ((va dinh) OR (va dan)) vi cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ky nang xa hoi. ((hieu vu) OR (hieu va)) cham loc ((va dinh) or (va dan)) vi cua tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach ky nang xa hoi. ((hieu vu) OR (hieu va)) cham loc ((va dinh) or (va dan)) vi cua tre*.