Perhaps you should try some spelling variations:
thu sach » thuat sach, thuoc sach, thu hoach
han nang » phan nang, van nang, ban nang
ban hanh » ban hang
ve triet » va trien, su triet
tu sach » su sach, te sach, tu cach
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
cac xuc » cam xuc, cac nuoc, chat xuc
vi ve » va ve, gi ve, ve ve

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) OR (thu sach)) han nang xa hoi. hieu va cac xuc ((van ban) or (ban hanh)) vi ve triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((tu sach) OR (thu sach)) han nang xa hoi. hieu va cac xuc ((van ban) OR (ban hanh)) vi ve triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((tu sach) OR (thu sach)) han nang xa hoi. hieu va cac xuc ((van ban) or (ban hanh)) vi ve triet".
• Adding a wildcard symbol may retrieve word variants: ((tu sach) OR (thu sach)) han nang xa hoi. hieu va cac xuc ((van ban) or (ban hanh)) vi ve triet*.