Perhaps you should try some spelling variations:
toc sach » hoc sach, doc sach, thuoc sach
vuc nang » cuc nang, vu nang, chuc nang
van hanh » van thanh, ban hanh, van anh
hieu ve » hieu va, hieu van
xuc van » duc van, luc van, vuc van
nang ma » tang ma, sang ma, nang cao
ve cam » ve cham, ve cac, va cam
ma hoi » mai hoi, xa hoi, ma hoa
de cua » le cua, te cua, dieu cua

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)) vuc nang ma hoi. hieu ve cam xuc van hanh ((dai cua) or (de cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((te sach) OR (toc sach)) vuc nang ma hoi. hieu ve cam xuc van hanh ((dai cua) OR (de cua)) tre.
• Adding a wildcard symbol may retrieve word variants: ((te sach) or (toc sach)) vuc nang ma hoi. hieu ve cam xuc van hanh ((dai cua) or (de cua)) tre*.