Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
vuc nang » cuc nang, chuc nang, van nang
dung van » duong van, dung va, dang van
vu nang » va nang, vu dang, v nang
va pham » van pham, va phat, va phap
duy van » duy vat
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: thuat sach ((vu nang) or (vuc nang)) xa hoi. lieu va pham ((duy van) OR (dung van)) hanh vi cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat sach ((vu nang) OR (vuc nang)) xa hoi. lieu va pham ((duy van) OR (dung van)) hanh vi cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat sach ((vu nang) or (vuc nang)) xa hoi. lieu va pham ((duy van) OR (dung van)) hanh vi cua te".
• Adding a wildcard symbol may retrieve word variants: thuat sach ((vu nang) or (vuc nang)) xa hoi. lieu va pham ((duy van) OR (dung van)) hanh vi cua te*.