Perhaps you should try some spelling variations:
vu sach » vu bach, su sach, vu khach
va hanh » van hanh, va thanh, va danh
cac xuc » cam xuc, cac nuoc, chat xuc
sach ky » sac ky, sach y, sach ty
hieu va » lieu va, hieu qua
dai hai » dai han, dai hoi, dai tai
tai hai » thi hai, tai ha, tai phan
ky sang » ky nang, ky dang, ky tang
va dan » ca dan, va dao, va dau
vi cua » vai cua, di cua
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: vu sach ky sang ((tai hai) OR (dai hai)). hieu va cac xuc ((va hanh) or (va dan)) vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ky sang ((tai hai) OR (dai hai)). hieu va cac xuc ((va hanh) OR (va dan)) vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ky sang ((tai hai) OR (dai hai)). hieu va cac xuc ((va hanh) or (va dan)) vi cua te".
• Adding a wildcard symbol may retrieve word variants: vu sach ky sang ((tai hai) OR (dai hai)). hieu va cac xuc ((va hanh) or (va dan)) vi cua te*.