Perhaps you should try some spelling variations:
thuat sach » thuat lanh, thuat san
vuc nang » cuc nang, chuc nang, van nang
pham duy » pham duc
vu nang » va nang, vu dang, v nang
va pham » van pham, va phat, va phap
va hanh » van hanh, va thanh, va danh
duy va » duy vat, duy van, day va
vi cua » vai cua
di cua » dai cua, doi cua, de 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 ((vu nang) or (vuc nang)) xa hoi. lieu va pham duy va hanh ((vi cua) OR (di cua)) tre~.
• 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 va hanh ((vi cua) OR (di cua)) tre.
• 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 va hanh ((vi cua) OR (di cua)) tre".
• Adding a wildcard symbol may retrieve word variants: thuat sach ((vu nang) or (vuc nang)) xa hoi. lieu va pham duy va hanh ((vi cua) OR (di cua)) tre*.