Perhaps you should try some spelling variations:
khong luong » khong xuong, thuong luong, phuong luong
thieu manh » hieu manh, tien manh, trieu minh
hoc thieu » toc thieu, hoc hien
trung cua » truong cua, trung tuan, dung cua
trung cap » truong cao, trung tam
ninh toan » nin toan, hinh toan, minh toan

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc thieu manh - hanh ((trung cua) or (trung cap)) khong luong ((ninh toan) OR (tinh toan)) tap~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc thieu manh - hanh ((trung cua) OR (trung cap)) khong luong ((ninh toan) OR (tinh toan)) tap.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc thieu manh - hanh ((trung cua) or (trung cap)) khong luong ((ninh toan) OR (tinh toan)) tap".
• Adding a wildcard symbol may retrieve word variants: hoc thieu manh - hanh ((trung cua) or (trung cap)) khong luong ((ninh toan) OR (tinh toan)) tap*.