Perhaps you should try some spelling variations:
thuc van » thuc vat, thuc dan, thuc va
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
nang xa » nang x, lang xa, nang ma
hanh di » hanh vi, hanh de, hang di
y nang » ky nang, ly nang, v nang
ve tai » te tai, le tai, ve tac
de tai » de thi, te tai
di cua » dai cua, doi cua, de 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: tu sach y nang xa hoi. hieu ((((ve tai) OR (de tai))) or (va cac)) thuc van hanh di cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y nang xa hoi. hieu ((((ve tai) OR (de tai))) OR (va cac)) thuc van hanh di cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach y nang xa hoi. hieu ((((ve tai) OR (de tai))) or (va cac)) thuc van hanh di cua te".
• Adding a wildcard symbol may retrieve word variants: tu sach y nang xa hoi. hieu ((((ve tai) OR (de tai))) or (va cac)) thuc van hanh di cua te*.