Perhaps you should try some spelling variations:
chay tren » thai tren, ca tren, cau tren
tang hanh » tang thanh, dang hanh, nang hanh
duc tang » duc thang, duc tan, tuc tang
chau tre » chau tho, cho tre, cau tra
hanh tai » thanh tai, hang tai, han tai
thu sach » tu sach, thuat sach, thuoc sach
hieu va » lieu va, hieu qua
sach ky » sac ky, sach y, sach ty
hieu ve » hieu van
nang xa » nang x, lang xa, nang ma
cam duc » cam xuc, cao duc, pham duc

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ky nang xa hoi. ((hieu ve) OR (hieu va)) cam duc tang hanh tai ((chau tre) or (chay tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ky nang xa hoi. ((hieu ve) OR (hieu va)) cam duc tang hanh tai ((chau tre) OR (chay tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu sach ky nang xa hoi. ((hieu ve) OR (hieu va)) cam duc tang hanh tai ((chau tre) or (chay tren))".
• Adding a wildcard symbol may retrieve word variants: thu sach ky nang xa hoi. ((hieu ve) OR (hieu va)) cam duc tang hanh tai ((chau tre) or (chay tren))*.