Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
hanh hoi » hanh thoi, hanh noi, hanh hoa
hoi cua » hoi chuc
luc van » luoc van, luu van, luc va
duc van » duc va, duc tan, duc manh
hieu va » lieu va, hieu qua
va chat » van chat, va phat, cao chat
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
ma hoi » mai hoi, xa hoi, ma hoa
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: ((te sach) OR (toc sach)) ty nang ma hoi. hieu va chat ((duc van) or (luc van)) hanh hoi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) ty nang ma hoi. hieu va chat ((duc van) OR (luc van)) hanh hoi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((te sach) OR (toc sach)) ty nang ma hoi. hieu va chat ((duc van) or (luc van)) hanh hoi cua te".
• Adding a wildcard symbol may retrieve word variants: ((te sach) OR (toc sach)) ty nang ma hoi. hieu va chat ((duc van) or (luc van)) hanh hoi cua te*.