Perhaps you should try some spelling variations:
thong thuong » thong thong, hang thuong, cong thuong
thanh nung » thanh tung, thanh hung, thanh dung
hieu cach » chieu sach, hieu ca, biet cach
dang tran » dang thanh, quang tran, hoang tran
tran chau » tranh chap, tran huu
hieu cac » hieu luc, hieu va, hieu van
nung cao » nang cao, nhung cau, quang cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc ((hieu cach) OR (hieu cac)) - thanh nung cao ((thong thuong) or (tuong duong)) dang tran chau~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc ((hieu cach) OR (hieu cac)) - thanh nung cao ((thong thuong) OR (tuong duong)) dang tran chau.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc ((hieu cach) OR (hieu cac)) - thanh nung cao ((thong thuong) or (tuong duong)) dang tran chau".
• Adding a wildcard symbol may retrieve word variants: toc ((hieu cach) OR (hieu cac)) - thanh nung cao ((thong thuong) or (tuong duong)) dang tran chau*.