Perhaps you should try some spelling variations:
tru nang » tra nang, tri nang, truc nano
thi nang » thi cong, ki nang, thi hanh
hieu van » hieu va, thien van, lieu va
ban hanh » ban hang
tu sach » thu sach, su sach, te sach
van cam » van nam, van lam, van cau
cam cua » ca cua, nam cua, cau cua
vai cua » dai cua, hai cua, lai cua
vi cua » di cua

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ((tru nang) or (thi nang)) xa hoi. hieu van cam cua ban hanh ((vi cua) OR (vai cua)) tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((tru nang) OR (thi nang)) xa hoi. hieu van cam cua ban hanh ((vi cua) OR (vai cua)) tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ((tru nang) or (thi nang)) xa hoi. hieu van cam cua ban hanh ((vi cua) OR (vai cua)) tre".
• Adding a wildcard symbol may retrieve word variants: tu sach ((tru nang) or (thi nang)) xa hoi. hieu van cam cua ban hanh ((vi cua) OR (vai cua)) tre*.